Zbrojovka, which started as a metal foundry, manufactured engines for German airplanes during World War II. At the same time, a tractor was developed, and production began in 1946. The tractor, named Zetor 25, had a 2-cylinder water-cooled swirl chamber diesel engine. It had 5 forward and 1 reverse gear. Advanced technology at the time included a differential lock. Additionally, steering brakes were part of the equipment. A mechanical lift was an optional accessory.

In 1951, the updated 25 A and its parallel model 25 K, designed for fieldwork, were introduced. Differences included, among other things, a portal front axle, tire size, engine maximum speed, and transmission gear ratios. The A model had a hydraulic lift as standard, and later the K model did too. The K model's speeds were much slower. Both models now had six forward and two reverse gears. The exhaust pipe was directed upwards, and the cabin was improved with better pedal placement and a new seat.

The 25 series remained in production until 1961. Nearly 160,000 units were produced in total, of which over 60% were exported. About 8,000 units ended up in Finland. The most common colors were pale green with yellow rims and brown with red rims, though several shades were used. Rarer red and blue versions had white rims. At the time, the resale value of Zetor tractors dropped quickly, but in the 1990s, the 25 gained popularity in Finland as a hobby tractor. The 25's 1-cylinder parallel model was the Zetor 15, of which about 2,200 units were produced.

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